package com.ulwx.tool;

/* Copyright 2002-2005 The Apache Software Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

public class Base64 {

	/** Specify encoding (value is <tt>true</tt>). */
	public final static boolean ENCODE = true;

	/** Specify decoding (value is <tt>false</tt>). */
	public final static boolean DECODE = false;

	/** Maximum line length (76) of Base64 output. */
	private final static int MAX_LINE_LENGTH = 76;

	/** The equals sign (=) as a byte. */
	private final static byte EQUALS_SIGN = (byte)'=';

	/** The new line character (\n) as a byte. */
	private final static byte NEW_LINE = (byte)'\n';

	/** The 64 valid Base64 values. */
	private final static byte[] ALPHABET = { (byte)'A', (byte)'B', (byte)'C',
			(byte)'D', (byte)'E', (byte)'F', (byte)'G', (byte)'H', (byte)'I',
			(byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N', (byte)'O',
			(byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U',
			(byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z', (byte)'a',
			(byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g',
			(byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m',
			(byte)'n', (byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s',
			(byte)'t', (byte)'u', (byte)'v', (byte)'w', (byte)'x', (byte)'y',
			(byte)'z', (byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4',
			(byte)'5', (byte)'6', (byte)'7', (byte)'8', (byte)'9', (byte)'+',
			(byte)'/' };

	/**
	 * Translates a Base64 value to either its 6-bit reconstruction value or a
	 * negative number indicating some other meaning.
	 **/
	private final static byte[] DECODABET = { -9, -9, -9, -9, -9, -9, -9, -9,
			-9, // Decimal 0 - 8
			-5, -5, // Whitespace: Tab and Linefeed
			-9, -9, // Decimal 11 - 12
			-5, // Whitespace: Carriage Return
			-9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 14 -
																// 26
			-9, -9, -9, -9, -9, // Decimal 27 - 31
			-5, // Whitespace: Space
			-9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 33 - 42
			62, // Plus sign at decimal 43
			-9, -9, -9, // Decimal 44 - 46
			63, // Slash at decimal 47
			52, 53, 54, 55, 56, 57, 58, 59, 60, 61, // Numbers zero through nine
			-9, -9, -9, // Decimal 58 - 60
			-1, // Equals sign at decimal 61
			-9, -9, -9, // Decimal 62 - 64
			0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, // Letters 'A' through
															// 'N'
			14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, // Letters 'O'
															// through 'Z'
			-9, -9, -9, -9, -9, -9, // Decimal 91 - 96
			26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, // Letters 'a'
																// through 'm'
			39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, // Letters 'n'
																// through 'z'
			-9, -9, -9, -9 // Decimal 123 - 126
	/*
	 * ,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 127 - 139
	 * -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 140 - 152
	 * -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 153 - 165
	 * -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 166 - 178
	 * -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 179 - 191
	 * -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 192 - 204
	 * -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 205 - 217
	 * -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 218 - 230
	 * -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 231 - 243
	 * -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 244 - 255
	 */
	};

	private final static byte BAD_ENCODING = -9; // Indicates error in encoding
	private final static byte WHITE_SPACE_ENC = -5; // Indicates white space in
													// encoding
	private final static byte EQUALS_SIGN_ENC = -1; // Indicates equals sign in
													// encoding

	/** Defeats instantiation. */
	private Base64() {
	}

	/**
	 * Testing. Feel free--in fact I encourage you--to throw out this entire
	 * "main" method when you actually deploy this code.
	 */
	public static void main(String[] args) throws Exception {
		byte[] bytes1 = { (byte)2, (byte)2, (byte)3, (byte)0, (byte)9 }; // My
																			// zip
																			// code
		byte[] bytes2 = { (byte)99, (byte)2, (byte)2, (byte)3, (byte)0, (byte)9 };
		String s = encodeString("您好。", "gbk");
		System.out.println(s);
		s = Base64.decodeToString(s, "gbk");
		System.out.println(s);

	} // end main

	/* ******** E N C O D I N G M E T H O D S ******** */

	/**
	 * Encodes the first three bytes of array <var>threeBytes</var> and returns
	 * a four-byte array in Base64 notation.
	 * 
	 * @param threeBytes
	 *            the array to convert
	 * @return four byte array in Base64 notation.
	 * @since 1.3
	 */
	private static byte[] encode3to4(byte[] threeBytes) {
		return encode3to4(threeBytes, 3);
	} // end encodeToBytes

	/**
	 * Encodes up to the first three bytes of array <var>threeBytes</var> and
	 * returns a four-byte array in Base64 notation. The actual number of
	 * significant bytes in your array is given by <var>numSigBytes</var>. The
	 * array <var>threeBytes</var> needs only be as big as
	 * <var>numSigBytes</var>.
	 * 
	 * @param threeBytes
	 *            the array to convert
	 * @param numSigBytes
	 *            the number of significant bytes in your array
	 * @return four byte array in Base64 notation.
	 * @since 1.3
	 */
	private static byte[] encode3to4(byte[] threeBytes, int numSigBytes) {
		byte[] dest = new byte[4];
		encode3to4(threeBytes, 0, numSigBytes, dest, 0);
		return dest;
	}

	/**
	 * Encodes up to three bytes of the array <var>source</var> and writes the
	 * resulting four Base64 bytes to <var>destination</var>. The source and
	 * destination arrays can be manipulated anywhere along their length by
	 * specifying <var>srcOffset</var> and <var>destOffset</var>. This method
	 * does not check to make sure your arrays are large enough to accomodate
	 * <var>srcOffset</var> + 3 for the <var>source</var> array or
	 * <var>destOffset</var> + 4 for the <var>destination</var> array. The
	 * actual number of significant bytes in your array is given by
	 * <var>numSigBytes</var>.
	 * 
	 * @param source
	 *            the array to convert
	 * @param srcOffset
	 *            the index where conversion begins
	 * @param numSigBytes
	 *            the number of significant bytes in your array
	 * @param destination
	 *            the array to hold the conversion
	 * @param destOffset
	 *            the index where output will be put
	 * @return the <var>destination</var> array
	 * @since 1.3
	 */
	private static byte[] encode3to4(byte[] source, int srcOffset,
			int numSigBytes, byte[] destination, int destOffset) {
		// 1 2 3
		// 01234567890123456789012345678901 Bit position
		// --------000000001111111122222222 Array position from threeBytes
		// --------| || || || | Six bit groups to index ALPHABET
		// >>18 >>12 >> 6 >> 0 Right shift necessary
		// 0x3f 0x3f 0x3f Additional AND

		// Create buffer with zero-padding if there are only one or two
		// significant bytes passed in the array.
		// We have to shift left 24 in order to flush out the 1's that appear
		// when Java treats a value as negative that is cast from a byte to an
		// int.
		int inBuff = (numSigBytes > 0 ? ((source[srcOffset] << 24) >>> 8) : 0)
				| (numSigBytes > 1 ? ((source[srcOffset + 1] << 24) >>> 16) : 0)
				| (numSigBytes > 2 ? ((source[srcOffset + 2] << 24) >>> 24) : 0);

		switch (numSigBytes) {
			case 3:
				destination[destOffset] = ALPHABET[(inBuff >>> 18)];
				destination[destOffset + 1] = ALPHABET[(inBuff >>> 12) & 0x3f];
				destination[destOffset + 2] = ALPHABET[(inBuff >>> 6) & 0x3f];
				destination[destOffset + 3] = ALPHABET[(inBuff) & 0x3f];
				return destination;

			case 2:
				destination[destOffset] = ALPHABET[(inBuff >>> 18)];
				destination[destOffset + 1] = ALPHABET[(inBuff >>> 12) & 0x3f];
				destination[destOffset + 2] = ALPHABET[(inBuff >>> 6) & 0x3f];
				destination[destOffset + 3] = EQUALS_SIGN;
				return destination;

			case 1:
				destination[destOffset] = ALPHABET[(inBuff >>> 18)];
				destination[destOffset + 1] = ALPHABET[(inBuff >>> 12) & 0x3f];
				destination[destOffset + 2] = EQUALS_SIGN;
				destination[destOffset + 3] = EQUALS_SIGN;
				return destination;

			default:
				return destination;
		} // end switch
	} // end encode3to4

	/**
	 * Serializes an object and returns the Base64-encoded version of that
	 * serialized object. If the object cannot be serialized or there is another
	 * error, the method will return <tt>null</tt>.
	 * 
	 * @param serializableObject
	 *            The object to encode
	 * @return The Base64-encoded object
	 * @since 1.4
	 */
	public static String encodeObject(java.io.Serializable serializableObject) {
		return encodeObject(serializableObject, true);
	} // end encodeObject

	/**
	 * Serializes an object and returns the Base64-encoded version of that
	 * serialized object. If the object cannot be serialized or there is another
	 * error, the method will return <tt>null</tt>.
	 * 
	 * @param serializableObject
	 *            The object to encode
	 * @param breakLines
	 *            Break lines at 80 characters or less.
	 * @return The Base64-encoded object
	 * @since 1.4
	 */
	public static String encodeObject(java.io.Serializable serializableObject,
			boolean breakLines) {
		java.io.ByteArrayOutputStream baos = null;
		java.io.OutputStream b64os = null;
		java.io.ObjectOutputStream oos = null;

		try {
			baos = new java.io.ByteArrayOutputStream();
			b64os = new Base64.OutputStream(baos, Base64.ENCODE, breakLines);
			oos = new java.io.ObjectOutputStream(b64os);

			oos.writeObject(serializableObject);
		} // end try
		catch (java.io.IOException e) {
			e.printStackTrace();
			return null;
		} // end catch
		finally {
			try {
				oos.close();
			} catch (Exception e) {
				// ignore it
			}
			try {
				b64os.close();
			} catch (Exception e) {
				// ignore it
			}
			try {
				baos.close();
			} catch (Exception e) {
				// ignore it
			}
		} // end finally

		return new String(baos.toByteArray());
	} // end encode

	/**
	 * Encodes a byte array into Base64 notation. Equivalen to calling
	 * <code>encodeBytes( source, 0, source.length )</code>
	 * 
	 * @param source
	 *            The data to convert
	 * @since 1.4
	 */
	public static String encodeBytes(byte[] source) throws Exception {
		return encodeBytes(source, true);
	} // end encodeBytes

	/**
	 * Encodes a byte array into Base64 notation. Equivalen to calling
	 * <code>encodeBytes( source, 0, source.length )</code>
	 * 
	 * @param source
	 *            The data to convert
	 * @param breakLines
	 *            Break lines at 80 characters or less.
	 * @since 1.4
	 */
	private static String encodeBytes(byte[] source, boolean breakLines)
			throws Exception {
		return encodeBytes(source, 0, source.length, breakLines);
	} // end encodeBytes

	/**
	 * Encodes a byte array into Base64 notation.
	 * 
	 * @param source
	 *            The data to convert
	 * @param off
	 *            Offset in array where conversion should begin
	 * @param len
	 *            Length of data to convert
	 * @since 1.4
	 */
	public static String encodeBytes(byte[] source, int off, int len)
			throws Exception {
		return encodeBytes(source, off, len, true);
	} // end encodeBytes

	/**
	 * Encodes a byte array into Base64 notation.
	 * 
	 * @param source
	 *            The data to convert
	 * @param off
	 *            Offset in array where conversion should begin
	 * @param len
	 *            Length of data to convert
	 * @param breakLines
	 *            Break lines at 80 characters or less.
	 * @since 1.4
	 */
	public static String encodeBytes(byte[] source, int off, int len,
			boolean breakLines) throws Exception {
		int len43 = len * 4 / 3;
		byte[] outBuff = new byte[(len43) // Main 4:3
				+ ((len % 3) > 0 ? 4 : 0) // Account for padding
				+ (breakLines ? (len43 / MAX_LINE_LENGTH) : 0)]; // New lines
		int d = 0;
		int e = 0;
		int len2 = len - 2;
		int lineLength = 0;
		for (; d < len2; d += 3, e += 4) {
			encode3to4(source, d + off, 3, outBuff, e);

			lineLength += 4;
			if (breakLines && lineLength == MAX_LINE_LENGTH) {
				outBuff[e + 4] = NEW_LINE;
				e++;
				lineLength = 0;
			} // end if: end of line
		} // en dfor: each piece of array

		if (d < len) {
			encode3to4(source, d + off, len - d, outBuff, e);
			e += 4;
		} // end if: some padding needed

		return new String(outBuff, 0, e, "iso-8859-1");
	} // end encodeBytes

	/**
	 * Encodes a string in Base64 notation with line breaks after every 75
	 * Base64 characters.
	 * 
	 * @param s
	 *            the string to encode
	 * @return the encoded string
	 * @since 1.3
	 */
	public static String encodeString(String s, String charset)
			throws Exception {
		return encodeString(s, true, charset);
	} // end encodeString

	/**
	 * Encodes a string in Base64 notation with line breaks after every 75
	 * Base64 characters.
	 * 
	 * @param s
	 *            the string to encode
	 * @param breakLines
	 *            Break lines at 80 characters or less.
	 * @return the encoded string
	 * @since 1.3
	 */
	private static String encodeString(String s, boolean breakLines,
			String charset) throws Exception {
		return encodeBytes(s.getBytes(charset), breakLines);
	} // end encodeString

	/* ******** D E C O D I N G M E T H O D S ******** */

	/**
	 * Decodes the first four bytes of array <var>fourBytes</var> and returns an
	 * array up to three bytes long with the decoded values.
	 * 
	 * @param fourBytes
	 *            the array with Base64 content
	 * @return array with decoded values
	 * @since 1.3
	 */
	private static byte[] decode4to3(byte[] fourBytes) {
		byte[] outBuff1 = new byte[3];
		int count = decode4to3(fourBytes, 0, outBuff1, 0);
		byte[] outBuff2 = new byte[count];

		System.arraycopy(outBuff1, 0, outBuff2, 0, count);
		return outBuff2;
	}

	/**
	 * Decodes four bytes from array <var>source</var> and writes the resulting
	 * bytes (up to three of them) to <var>destination</var>. The source and
	 * destination arrays can be manipulated anywhere along their length by
	 * specifying <var>srcOffset</var> and <var>destOffset</var>. This method
	 * does not check to make sure your arrays are large enough to accomodate
	 * <var>srcOffset</var> + 4 for the <var>source</var> array or
	 * <var>destOffset</var> + 3 for the <var>destination</var> array. This
	 * method returns the actual number of bytes that were converted from the
	 * Base64 encoding.
	 * 
	 * 
	 * @param source
	 *            the array to convert
	 * @param srcOffset
	 *            the index where conversion begins
	 * @param destination
	 *            the array to hold the conversion
	 * @param destOffset
	 *            the index where output will be put
	 * @return the number of decoded bytes converted
	 * @since 1.3
	 */
	private static int decode4to3(byte[] source, int srcOffset,
			byte[] destination, int destOffset) {
		// Example: Dk==
		if (source[srcOffset + 2] == EQUALS_SIGN) {
			// Two ways to do the same thing. Don't know which way I like best.
			// int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6
			// )
			// | ( ( DECODABET[ source[ srcOffset + 1] ] << 24 ) >>> 12 );
			int outBuff = ((DECODABET[source[srcOffset]] & 0xFF) << 18)
					| ((DECODABET[source[srcOffset + 1]] & 0xFF) << 12);

			destination[destOffset] = (byte)(outBuff >>> 16);
			return 1;
		}

		// Example: DkL=
		else if (source[srcOffset + 3] == EQUALS_SIGN) {
			// Two ways to do the same thing. Don't know which way I like best.
			// int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6
			// )
			// | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 )
			// | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 );
			int outBuff = ((DECODABET[source[srcOffset]] & 0xFF) << 18)
					| ((DECODABET[source[srcOffset + 1]] & 0xFF) << 12)
					| ((DECODABET[source[srcOffset + 2]] & 0xFF) << 6);

			destination[destOffset] = (byte)(outBuff >>> 16);
			destination[destOffset + 1] = (byte)(outBuff >>> 8);
			return 2;
		}

		// Example: DkLE
		else {
			try {
				// Two ways to do the same thing. Don't know which way I like
				// best.
				// int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 )
				// >>> 6 )
				// | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 )
				// | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 )
				// | ( ( DECODABET[ source[ srcOffset + 3 ] ] << 24 ) >>> 24 );
				int outBuff = ((DECODABET[source[srcOffset]] & 0xFF) << 18)
						| ((DECODABET[source[srcOffset + 1]] & 0xFF) << 12)
						| ((DECODABET[source[srcOffset + 2]] & 0xFF) << 6)
						| ((DECODABET[source[srcOffset + 3]] & 0xFF));

				destination[destOffset] = (byte)(outBuff >> 16);
				destination[destOffset + 1] = (byte)(outBuff >> 8);
				destination[destOffset + 2] = (byte)(outBuff);

				return 3;
			} catch (Exception e) {

				return -1;
			} // end catch
		}
	} // end decodeToBytes

	/**
	 * Decodes data from Base64 notation.
	 * 
	 * @param s
	 *            the string to decode
	 * @return the decoded data
	 * @since 1.4
	 */
	public static byte[] decode(String s) throws Exception {
		byte[] bytes = s.getBytes("iso-8859-1");
		return decode(bytes, 0, bytes.length);
	} // end decode

	/**
	 * Decodes data from Base64 notation and returns it as a string. Equivlaent
	 * to calling <code>new String( decode( s ) )</code>
	 * 
	 * @param s
	 *            the strind to decode
	 * @return The data as a string
	 * @since 1.4
	 */
	public static String decodeToString(String s, String charset)
			throws Exception {
		return new String(decode(s), charset);
	} // end decodeToString

	/**
	 * Attempts to decode Base64 data and deserialize a Java Object within.
	 * Returns <tt>null if there was an error.
	 * 
	 * @param encodedObject
	 *            The Base64 data to decode
	 * @return The decoded and deserialized object
	 * @since 1.4
	 */
	public static Object decodeToObject(String encodedObject) throws Exception {
		byte[] objBytes = decode(encodedObject);

		java.io.ByteArrayInputStream bais = null;
		java.io.ObjectInputStream ois = null;

		try {
			bais = new java.io.ByteArrayInputStream(objBytes);
			ois = new java.io.ObjectInputStream(bais);

			return ois.readObject();
		} // end try
		catch (java.io.IOException e) {
			e.printStackTrace();
			return null;
		} // end catch
		catch (java.lang.ClassNotFoundException e) {
			e.printStackTrace();
			return null;
		} // end catch
		finally {
			try {
				bais.close();
			} catch (Exception e) {
				// ignore it
			}
			try {
				ois.close();
			} catch (Exception e) {
				// ignore it
			}
		} // end finally
	} // end decodeObject

	/**
	 * Decodes Base64 content in byte array format and returns the decoded byte
	 * array.
	 * 
	 * @param source
	 *            The Base64 encoded data
	 * @param off
	 *            The offset of where to begin decoding
	 * @param len
	 *            The length of characters to decode
	 * @return decoded data
	 * @since 1.3
	 */
	private static byte[] decode(byte[] source, int off, int len) {
		int len34 = len * 3 / 4;
		byte[] outBuff = new byte[len34]; // Upper limit on size of output
		int outBuffPosn = 0;

		byte[] b4 = new byte[4];
		int b4Posn = 0;
		int i = 0;
		byte sbiCrop = 0;
		byte sbiDecode = 0;
		for (i = 0; i < len; i++) {
			sbiCrop = (byte)(source[i] & 0x7f); // Only the low seven bits
			sbiDecode = DECODABET[sbiCrop];

			if (sbiDecode >= WHITE_SPACE_ENC) // White space, Equals sign or
												// better
			{
				if (sbiDecode >= EQUALS_SIGN_ENC) {
					b4[b4Posn++] = sbiCrop;
					if (b4Posn > 3) {
						outBuffPosn += decode4to3(b4, 0, outBuff, outBuffPosn);
						b4Posn = 0;

						// If that was the equals sign, break out of 'for' loop
						if (sbiCrop == EQUALS_SIGN)
							break;
					} // end if: quartet built

				} // end if: equals sign or better

			} // end if: white space, equals sign or better
			else {
				return null;
			} // end else:
		} // each input character

		byte[] out = new byte[outBuffPosn];
		System.arraycopy(outBuff, 0, out, 0, outBuffPosn);
		return out;
	} // end decode

	/* ******** I N N E R C L A S S I N P U T S T R E A M ******** */

	/**
	 * A {@link Base64.InputStream} will read data from another
	 * {@link java.io.InputStream}, given in the constructor, and encode/decode
	 * to/from Base64 notation on the fly.
	 * 
	 * @see Base64
	 * @see java.io.FilterInputStream
	 * @since 1.3
	 */
	public static class InputStream extends java.io.FilterInputStream {
		private boolean encode; // Encoding or decoding
		private int position; // Current position in the buffer
		private byte[] buffer; // Small buffer holding converted data
		private int bufferLength; // Length of buffer (3 or 4)
		private int numSigBytes; // Number of meaningful bytes in the buffer
		private int lineLength;
		private boolean breakLines; // Break lines at less than 80 characters

		/**
		 * Constructs a {@link Base64.InputStream} in DECODE mode.
		 * 
		 * @param in
		 *            the {@link java.io.InputStream} from which to read data.
		 * @since 1.3
		 */
		public InputStream(java.io.InputStream in) {
			this(in, Base64.DECODE);
		} // end constructor

		/**
		 * Constructs a {@link Base64.InputStream} in either ENCODE or DECODE
		 * mode.
		 * 
		 * @param in
		 *            the {@link java.io.InputStream} from which to read data.
		 * @param encode
		 *            Conversion direction
		 * @see Base64#ENCODE
		 * @see Base64#DECODE
		 * @since 1.3
		 */
		public InputStream(java.io.InputStream in, boolean encode) {
			this(in, encode, true);
		} // end constructor

		/**
		 * Constructs a {@link Base64.InputStream} in either ENCODE or DECODE
		 * mode.
		 * 
		 * @param in
		 *            the {@link java.io.InputStream} from which to read data.
		 * @param encode
		 *            Conversion direction
		 * @param breakLines
		 *            Break lines at less than 80 characters.
		 * @see Base64#ENCODE
		 * @see Base64#DECODE
		 * @since 1.3
		 */
		public InputStream(java.io.InputStream in, boolean encode,
				boolean breakLines) {
			super(in);
			this.breakLines = breakLines;
			this.encode = encode;
			this.bufferLength = encode ? 4 : 3;
			this.buffer = new byte[bufferLength];
			this.position = -1;
			this.lineLength = 0;
		} // end constructor

		/**
		 * Reads enough of the input stream to convert to/from Base64 and
		 * returns the next byte.
		 * 
		 * @return next byte
		 * @since 1.3
		 */
		public int read() throws java.io.IOException {
			// Do we need to get data?
			if (position < 0) {
				if (encode) {
					byte[] b3 = new byte[3];
					int numBinaryBytes = 0;
					for (int i = 0; i < 3; i++) {
						try {
							int b = in.read();

							// If end of stream, b is -1.
							if (b >= 0) {
								b3[i] = (byte)b;
								numBinaryBytes++;
							} // end if: not end of stream

						} // end try: read
						catch (java.io.IOException e) {
							// Only a problem if we got no data at all.
							if (i == 0)
								throw e;

						} // end catch
					} // end for: each needed input byte

					if (numBinaryBytes > 0) {
						encode3to4(b3, 0, numBinaryBytes, buffer, 0);
						position = 0;
						numSigBytes = 4;
					} // end if: got data
					else {
						return -1;
					} // end else
				} // end if: encoding

				// Else decoding
				else {
					byte[] b4 = new byte[4];
					int i = 0;
					for (i = 0; i < 4; i++) {
						// Read four "meaningful" bytes:
						int b = 0;
						do {
							b = in.read();
						} while (b >= 0
								&& DECODABET[b & 0x7f] <= WHITE_SPACE_ENC);

						if (b < 0)
							break; // Reads a -1 if end of stream

						b4[i] = (byte)b;
					} // end for: each needed input byte

					if (i == 4) {
						numSigBytes = decode4to3(b4, 0, buffer, 0);
						position = 0;
					} // end if: got four characters
					else if (i == 0) {
						return -1;
					} // end else if: also padded correctly
					else {
						// Must have broken out from above.
						throw new java.io.IOException(
								"Improperly padded Base64 input.");
					} // end

				} // end else: decode
			} // end else: get data

			// Got data?
			if (position >= 0) {
				// End of relevant data?
				if ( /* !encode && */position >= numSigBytes)
					return -1;

				if (encode && breakLines && lineLength >= MAX_LINE_LENGTH) {
					lineLength = 0;
					return '\n';
				} // end if
				else {
					lineLength++; // This isn't important when decoding
									// but throwing an extra "if" seems
									// just as wasteful.

					int b = buffer[position++];

					if (position >= bufferLength)
						position = -1;

					return b & 0xFF; // This is how you "cast" a byte that's
										// intended to be unsigned.
				} // end else
			} // end if: position >= 0

			// Else error
			else {
				// When JDK1.4 is more accepted, use an assertion here.
				throw new java.io.IOException(
						"Error in Base64 code reading stream.");
			} // end else
		} // end read

		/**
		 * Calls {@link #read} repeatedly until the end of stream is reached or
		 * <var>len</var> bytes are read. Returns number of bytes read into
		 * array or -1 if end of stream is encountered.
		 * 
		 * @param dest
		 *            array to hold values
		 * @param off
		 *            offset for array
		 * @param len
		 *            max number of bytes to read into array
		 * @return bytes read into array or -1 if end of stream is encountered.
		 * @since 1.3
		 */
		public int read(byte[] dest, int off, int len)
				throws java.io.IOException {
			int i;
			int b;
			for (i = 0; i < len; i++) {
				b = read();

				// if( b < 0 && i == 0 )
				// return -1;

				if (b >= 0)
					dest[off + i] = (byte)b;
				else if (i == 0)
					return -1;
				else
					break; // Out of 'for' loop
			} // end for: each byte read
			return i;
		} // end read

	} // end inner class InputStream

	/* ******** I N N E R C L A S S O U T P U T S T R E A M ******** */

	/**
	 * A {@link Base64.OutputStream} will write data to another
	 * {@link java.io.OutputStream}, given in the constructor, and encode/decode
	 * to/from Base64 notation on the fly.
	 * 
	 * @see Base64
	 * @see java.io.FilterOutputStream
	 * @since 1.3
	 */
	public static class OutputStream extends java.io.FilterOutputStream {
		private boolean encode;
		private int position;
		private byte[] buffer;
		private int bufferLength;
		private int lineLength;
		private boolean breakLines;

		/**
		 * Constructs a {@link Base64.OutputStream} in ENCODE mode.
		 * 
		 * @param out
		 *            the {@link java.io.OutputStream} to which data will be
		 *            written.
		 * @since 1.3
		 */
		public OutputStream(java.io.OutputStream out) {
			this(out, Base64.ENCODE);
		} // end constructor

		/**
		 * Constructs a {@link Base64.OutputStream} in either ENCODE or DECODE
		 * mode.
		 * 
		 * @param out
		 *            the {@link java.io.OutputStream} to which data will be
		 *            written.
		 * @param encode
		 *            Conversion direction
		 * @see Base64#ENCODE
		 * @see Base64#DECODE
		 * @since 1.3
		 */
		public OutputStream(java.io.OutputStream out, boolean encode) {
			this(out, encode, true);
		} // end constructor

		/**
		 * Constructs a {@link Base64.OutputStream} in either ENCODE or DECODE
		 * mode.
		 * 
		 * @param out
		 *            the {@link java.io.OutputStream} to which data will be
		 *            written.
		 * @param encode
		 *            Conversion direction
		 * @param breakLines
		 *            Break lines to be less than 80 characters.
		 * @see Base64#ENCODE
		 * @see Base64#DECODE
		 * @since 1.3
		 */
		public OutputStream(java.io.OutputStream out, boolean encode,
				boolean breakLines) {
			super(out);
			this.breakLines = breakLines;
			this.encode = encode;
			this.bufferLength = encode ? 3 : 4;
			this.buffer = new byte[bufferLength];
			this.position = 0;
			this.lineLength = 0;
		} // end constructor

		/**
		 * Writes the byte to the output stream after converting to/from Base64
		 * notation. When encoding, bytes are buffered three at a time before
		 * the output stream actually gets a write() call. When decoding, bytes
		 * are buffered four at a time.
		 * 
		 * @param theByte
		 *            the byte to write
		 * @since 1.3
		 */
		public void write(int theByte) throws java.io.IOException {
			if (encode) {
				buffer[position++] = (byte)theByte;
				if (position >= bufferLength) // Enough to encode.
				{
					out.write(Base64.encode3to4(buffer, bufferLength));

					lineLength += 4;
					if (breakLines && lineLength >= MAX_LINE_LENGTH) {
						out.write(NEW_LINE);
						lineLength = 0;
					} // end if: end of line

					position = 0;
				} // end if: enough to output
			} // end if: encoding

			// Else, Decoding
			else {
				// Meaningful Base64 character?
				if (DECODABET[theByte & 0x7f] > WHITE_SPACE_ENC) {
					buffer[position++] = (byte)theByte;
					if (position >= bufferLength) // Enough to output.
					{
						out.write(Base64.decode4to3(buffer));
						position = 0;
					} // end if: enough to output
				} // end if: meaningful Base64 character
				else if (DECODABET[theByte & 0x7f] != WHITE_SPACE_ENC) {
					throw new java.io.IOException(
							"Invalid character in Base64 data.");
				} // end else: not white space either
			} // end else: decoding
		} // end write

		/**
		 * Calls {@link #write} repeatedly until <var>len</var> bytes are
		 * written.
		 * 
		 * @param theBytes
		 *            array from which to read bytes
		 * @param off
		 *            offset for array
		 * @param len
		 *            max number of bytes to read into array
		 * @since 1.3
		 */
		public void write(byte[] theBytes, int off, int len)
				throws java.io.IOException {
			for (int i = 0; i < len; i++) {
				write(theBytes[off + i]);
			} // end for: each byte written

		} // end write

		/**
		 * Appropriately pads Base64 notation when encoding or throws an
		 * exception if Base64 input is not properly padded when decoding.
		 * 
		 * @since 1.3
		 */
		public void flush() throws java.io.IOException {
			super.flush();

			if (position > 0) {
				if (encode) {
					out.write(Base64.encode3to4(buffer, position));
				} // end if: encoding
				else {
					throw new java.io.IOException(
							"Base64 input not properly padded.");
				} // end else: decoding
			} // end if: buffer partially full

			out.flush();
		} // end flush

		/**
		 * Flushes and closes stream.
		 * 
		 * @since 1.3
		 */
		public void close() throws java.io.IOException {
			super.close();
			// this.flush();

			out.close();

			buffer = null;
			out = null;
		} // end close

	} // end inner class OutputStream

} // end class Base64
